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5. Work, energy and power

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2 topics · 11 learning objectives

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  1. 5.1 Energy conservation

    1. • understand the concept of work, and recall and use work done = force × displacement in the direction of the force

    2. • recall and apply the principle of conservation of energy

    3. • recall and understand that the efficiency of a system is the ratio of useful energy output from the system to the total energy input

    4. • use the concept of efficiency to solve problems

    5. • define power as work done per unit time

    6. • solve problems using P = W / t

    7. • derive P = Fv and use it to solve problems

  2. 5.2 Gravitational potential energy and kinetic energy

    1. 5.2.1W = Fs, the formula ∆EP = mg∆h for gravitational potential energy changes in

      • derive, using W = Fs, the formula ∆EP = mg∆h for gravitational potential energy changes in a uniform gravitational field

    2. 5.2.2The formula ∆EP = mg∆h for gravitational potential energy changes in a

      • recall and use the formula ∆EP = mg∆h for gravitational potential energy changes in a uniform gravitational field

    3. 5.2.3The equations of motion, the formula for kinetic energy EK = 1/2 mv2

      • derive, using the equations of motion, the formula for kinetic energy EK = 1/2 mv2

    4. 5.2.4EK = 1/2 mv2

      • recall and use EK = 1/2 mv2